The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 2002
Filed:
Feb. 24, 2000
Naoki Okamoto, Osaka, JP;
Takeshi Misaku, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a receiver capable of receiving a plurality of television systems, a color transmission system discrimination circuit is provided, which is capable of exactly and rapidly determining a color transmission system which is being received. The color transmission system discrimination circuit includes: a killer state change detection circuit for detecting a change in three kinds of color killer signals corresponding to a burst signal component in a 90° phase, a burst signal component in a 180° phase, and a SECAM discrimination signal; a sequencer which is driven with an output signal of the killer state change detection circuit and performs the first, second, and third stages in this order respectively for a predetermined period of time; first latch circuits to for latching the color killer signal captured in the first stage; second latch circuits and for latching the color killer signal captured in the second stage; and a discrimination decoder for outputting a discrimination signal of a color system and a discrimination signal of a frequency of a reference sub-carrier signal, based on the color killer signal captured in the third stage and the output signals of the first and second latch circuits to